Installation on a catamaran:
2 stock alternators (115A) one on each engine, 2 smart bms 12/200 connected in parrallel via the Li-ion Batt+ port.
No specialized aternator regulator (internal stock regulator is preserved)
4 smart batteries Lifepo4 Victron in parrallel and 2 flooded batteries for engines start.
The purpose of dual bms is to separate/aggregate the alternators power.
Problem(s):
1. It's not possible to fully charge the batteries; the batteries tension never goes up to 13.50V (70 - 80% SOC)
2. When reading the BMS state via BT I can see 13.78V (and 13.8) for alternator tension and
3. charging current is 66% for one alternator and only 35% for the other, even when the alternators are cold (first 5 min. of charging)
Questions:
1. Is there a problem parrallelizing the BMS; are the two alternaors confuse each other with the battery tension, sensing from the bms?
2. 13.8V for the alternator tension seems adequate for the flooded start battery, but how to to get 14.2, 14.4V for the lithium batteries?
More details:
When on shore power the batteries are fully re-charged at 100% SOC via the multiplus charging function. Multiplus is connected on the system+ port
All the cells are fully equilibrated.
I know the limitations with stock alternators, but before the switch to lithium we had GEL batteries and it was possible to see 100 - 120A charging (during a limitate time, sure).
The alternator fuse on each bms is 100A so expecting 90x2 for some time.
Any suggestions or recommandation?
Thanks
